Publishers
- Christian Stoll 1
- Christie, Manson & Woods Ltd. 1
- Christoph Seigel 1
- Christopher Davies 11
- Christopher Foyle Publishing 1
- Christopher Frost 1
- Christopher Helm 27
- Christophers 2
- Chronica Botanica Company 1
- Chronicle Books 7
- Chronicle Communications Ltd. 1
- Chronosports 8
- Chronosports Gsn Publishing 1
- CHT Publishing 1
- Church Missionary Society 1
- Church Of England Zenana Missionary Society 1
- Cicada Books 1
- Cicerone Press 3
- Cirencester Newspaper Company 1
- Cirrus Associates 1
- Citta Di Torino 1
- Citta' Di Venezia 1
- City Of Birmingham 1
- City Of Birmingham Education Department 1
- City Of Portsmouth 1
- City Of Worcester 1
- City Press 1
- Civitas 1
- Claremont Books 1
- Clarendon Press 15
- Clarion Books 1
- Clarkes New Press 1
- Classic 2
- Classic Publications 3
- Clearview 1
- Clement Ingleby 1
- Clifton Books 1
- Climber's Club 2
- Clwydian-Press 1
- Clymer 2
- CMG Publishing 2
- Co-operative Wholesale Society 2
- Coachbuilt Press 1
- Cobden-Sanderson 1
- Cocorico 1
- Colden Publications 1
- Colin A Pomeroy 1
- Colin Baxter Photography Ltd. 1
- Colin Brent Books 1
- Colin Buchanan And Partners 1
- Colin Orchard 1
- Collection Parthenope 1
- Collectors' Books 1
- Collet's 1
- Collier Macmillan Publishers 2
- Collins 470
- Collins and Harvill 3
- Collins Clear-Type Press 88
- Collins Colour Camera Books 1
- Collins Lions 2
- Collins Voyager 1
- Collins Willow 4
- Colmans Foods 1
- Colnaghi And Co. 1
- Colnet 2
- Colorado Railroad Museum 1
- Colorgravure 1
- Colour Library Books 2
- Colour Library Direct 2
- Colourbox Publishing 1
- Colourpoint 1
- Columbia University Press 4
- Colwood Press Ltd 1
- Combined Publishing 3
- Comma International 1
- Commission Of Conservation Canada 1
- Commonwealth Agricultural Bureaux 1
- Commonwealth Scientific And Industrial Research Organization 1
- Commonwealth War Graves Commission 2
- Company Of Stationers 1
- Compassverlag 1
- Comstock Publishing Associates 2
- Comstock Publishing Company Inc. 1
- Concept Associates Ltd. 1
- Conchbooks 1
- Concord Publications Co. 1
- Connaissance Du Rail 4
- Conran Octopus Ltd. 1
- Consejo Superior De Investigaciones Cintificas 1
- Conservation Press 1
- Consiglio Nazionale Delle Ricerche 1
- Constable 12
- Constable & Co. Ltd. 22
- Constable and Company Ltd. 18
- Constable Young Books 3
- Constable Young Books Ltd. 1
- Continuum 2
- Conway 1
- Conway Maritime Press 29
- Copernicus 1